Physics, 09.01.2020 04:31 Jana1517

An iron boiler of mass 230 kg contains 830 kg of water at 18c.
a heater supplies energy at the rate of 52,000 kj/h. how longdoes
it take for the water a) to reach the boiling point, and b) toall
have changed to steam?

Answers: 3

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Answers

Answer from: arodriguez395

The total time is 41.38 hours.

Explanation:

Given that,

Mass 230 kg

Mass of water = 830 kg

Temperature = 18 C

Rate of energy supplied = 52000 Kj/h

Let the boiling temperature of the water be 100°C

(a). We need to calculate the energy

So from the principle of calorimeter

$m_{b}C_{i}(T_{b}-T_{i})+m_{w}C_{w}(T_{b}-T_{i})=Q_{i}$

Put the value into the formula

$230\times450+830\times4186(100-18)=Q_{i}$

$Q_{i}=285002660\ J$

$Q_{i}=2.85\times10^{8}\ J$

We need to calculate the time

Using formula of energy

$Q_{i}=Pt$

$t=\dfrac{Q_{i}}{P}$

Put the value into the formula

$t=\dfrac{2.85\times10^{8}}{52000\times10^{3}}$

$t=5.48\ hours$

(b). There is no change in temperature.

So the additional heat required to change the water into steam is

We need to calculate the energy

Using formula of energy

$Q=m_{w}L_{s}$

$Q=830\times22.6\times10^{5}$

$Q=1.87\times10^{9}\ J$

We need to calculate the additional time

Using formula of additional time

$t'=\dfrac{Q}{P}$

Put the value into the formula

$t'=\dfrac{1.87\times10^{9}}{52000\times10^{3}}$

$t'=35.9\ hours$

We need to calculate the total time

Using formula of time

t''=t+t'

Put the value into the formula

t''=5.48+35.9

$t''=41.38\ hours$

Hence, The total time is 41.38 hours.

Answer from: Quest

nah. i'm just sleepy.

Answer from: Quest

-first use of geothermal energy occurred more than 10,000 years ago in north america by american paleo-indians

-the first industrial use of geothermal energy began near pisa, italy in late 18th century

-in 1904, italian scientist piero ginori conti invented the first geothermal electric power plant in which steam was used to generate the power

-with the above experiment, the first geothermal plant in usa started in 1922 with a capacity of 250 kilowatts

-however, in 1946 first ground-source geothermal heat pump installed at commonwealth building in portland, oregon

-during the 1960’s, pacific gas and electric began operation of first large scale geothermal power plant in san francisco, producing 11 megawatts

-in 1973, when oil crisis began many countries began looking for renewable energy sources and by 1980’s geothermal heat pumps (ghp) started gaining popularity in order to reduce heating and cooling costs

-as effect of climate change started showing results, governments of various countries joined hands to fight against it, for which kyoto protocol was signed in japan in 1997, laid out emission targets for rich countries and required that they transfer funds and technology to developing countries, 184 countries have ratified it

hope this

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An iron boiler of mass 230 kg contains 830 kg of water at 18c.
a heater supplies energy at the...

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